Applets can only create top level windows which carry message "untrusted window". This helps protect one making operating system look alike windows which innocently request you type password or similar information
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e.g. suppose I wrote an applet that generated window saying "network connection broken" and put up identical window to internet login process. Most people would type in password without thinking!
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Applets cannot obtain user's username or home directory name.
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Applets cannot define system properties
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Applets cannot run any program on the client system using Runtime.exec().
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